From patchwork Thu Mar 23 13:30:48 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Simon Wunderlich X-Patchwork-Id: 9641107 X-Patchwork-Delegate: kvalo@adurom.com Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id B6D63601E9 for ; Thu, 23 Mar 2017 13:30:59 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id A833C284CE for ; Thu, 23 Mar 2017 13:30:59 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 9B791284F2; Thu, 23 Mar 2017 13:30:59 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 34A86284CE for ; Thu, 23 Mar 2017 13:30:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S964889AbdCWNa6 (ORCPT ); Thu, 23 Mar 2017 09:30:58 -0400 Received: from packetmixer.de ([79.140.42.25]:53388 "EHLO mail.mail.packetmixer.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753918AbdCWNaz (ORCPT ); Thu, 23 Mar 2017 09:30:55 -0400 Received: from kero.packetmixer.de (p2003007C6F5BE70009DEAF779F8714A6.dip0.t-ipconnect.de [IPv6:2003:7c:6f5b:e700:9de:af77:9f87:14a6]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.mail.packetmixer.de (Postfix) with ESMTPSA id C76BC62288; Thu, 23 Mar 2017 14:30:52 +0100 (CET) From: Simon Wunderlich To: ath10k@lists.infradead.org, ath9k-devel@qca.qualcomm.com Cc: linux-wireless@vger.kernel.org, Mathias Kretschmer , Simon Wunderlich Subject: [PATCH v2 3/3] ath9k: add noise floor override option Date: Thu, 23 Mar 2017 14:30:48 +0100 Message-Id: <20170323133048.30062-4-sw@simonwunderlich.de> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20170323133048.30062-1-sw@simonwunderlich.de> References: <20170323133048.30062-1-sw@simonwunderlich.de> Sender: linux-wireless-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Introduce a debugfs option to manually override the noise floor, ignoring the automatically tuned noise floor of the driver/hw. In my tests with a AR9580 based module and a tx99 5 MHz interferer, I could tune the noisefloor to -95 dBm or above to allow communication again. The automatic noise floor calibration sometimes could adapt to the situation as well, but not reliably and permanently. I would consider this "feature" experimental and interesting for people debugging the noise floor calibration or other effects of the hardware. Signed-off-by: Simon Wunderlich Signed-off-by: Mathias Kretschmer --- drivers/net/wireless/ath/ath9k/calib.c | 5 ++- drivers/net/wireless/ath/ath9k/debug.c | 62 ++++++++++++++++++++++++++++++++++ drivers/net/wireless/ath/ath9k/hw.h | 1 + 3 files changed, 67 insertions(+), 1 deletion(-) diff --git a/drivers/net/wireless/ath/ath9k/calib.c b/drivers/net/wireless/ath/ath9k/calib.c index 0f71146b781d..13ab6bc46775 100644 --- a/drivers/net/wireless/ath/ath9k/calib.c +++ b/drivers/net/wireless/ath/ath9k/calib.c @@ -254,7 +254,9 @@ int ath9k_hw_loadnf(struct ath_hw *ah, struct ath9k_channel *chan) if ((i >= AR5416_MAX_CHAINS) && !IS_CHAN_HT40(chan)) continue; - if (h) + if (ah->nf_override) + nfval = ah->nf_override; + else if (h) nfval = h[i].privNF; else nfval = default_nf; @@ -348,6 +350,7 @@ int ath9k_hw_loadnf(struct ath_hw *ah, struct ath9k_channel *chan) return 0; } +EXPORT_SYMBOL(ath9k_hw_loadnf); static void ath9k_hw_nf_sanitize(struct ath_hw *ah, s16 *nf) diff --git a/drivers/net/wireless/ath/ath9k/debug.c b/drivers/net/wireless/ath/ath9k/debug.c index 43930c336987..2e64977a8ab6 100644 --- a/drivers/net/wireless/ath/ath9k/debug.c +++ b/drivers/net/wireless/ath/ath9k/debug.c @@ -1191,6 +1191,65 @@ static const struct file_operations fops_tpc = { .llseek = default_llseek, }; +static ssize_t read_file_nf_override(struct file *file, + char __user *user_buf, + size_t count, loff_t *ppos) +{ + struct ath_softc *sc = file->private_data; + struct ath_hw *ah = sc->sc_ah; + char buf[32]; + unsigned int len; + + if (ah->nf_override == 0) + len = sprintf(buf, "off\n"); + else + len = sprintf(buf, "%d\n", ah->nf_override); + + return simple_read_from_buffer(user_buf, count, ppos, buf, len); +} + +static ssize_t write_file_nf_override(struct file *file, + const char __user *user_buf, + size_t count, loff_t *ppos) +{ + struct ath_softc *sc = file->private_data; + struct ath_hw *ah = sc->sc_ah; + long val; + char buf[32]; + ssize_t len; + + len = min(count, sizeof(buf) - 1); + if (copy_from_user(buf, user_buf, len)) + return -EFAULT; + + buf[len] = '\0'; + if (strncmp("off", buf, 3) == 0) + val = 0; + else if (kstrtol(buf, 0, &val)) + return -EINVAL; + + if (val > 0) + return -EINVAL; + + if (val < -120) + return -EINVAL; + + ah->nf_override = val; + + if (ah->curchan) + ath9k_hw_loadnf(ah, ah->curchan); + + return count; +} + +static const struct file_operations fops_nf_override = { + .read = read_file_nf_override, + .write = write_file_nf_override, + .open = simple_open, + .owner = THIS_MODULE, + .llseek = default_llseek, +}; + /* Ethtool support for get-stats */ #define AMKSTR(nm) #nm "_BE", #nm "_BK", #nm "_VI", #nm "_VO" @@ -1402,5 +1461,8 @@ int ath9k_init_debug(struct ath_hw *ah) debugfs_create_u16("airtime_flags", S_IRUSR | S_IWUSR, sc->debug.debugfs_phy, &sc->airtime_flags); + debugfs_create_file("nf_override", S_IRUSR | S_IWUSR, + sc->debug.debugfs_phy, sc, &fops_nf_override); + return 0; } diff --git a/drivers/net/wireless/ath/ath9k/hw.h b/drivers/net/wireless/ath/ath9k/hw.h index 2166f644599d..f06e02d1c342 100644 --- a/drivers/net/wireless/ath/ath9k/hw.h +++ b/drivers/net/wireless/ath/ath9k/hw.h @@ -807,6 +807,7 @@ struct ath_hw { u32 rfkill_gpio; u32 rfkill_polarity; u32 ah_flags; + s16 nf_override; bool reset_power_on; bool htc_reset_init;